This Part Fits the following kits / parts:

#67991 - HB DSJ-1SS (High Speed Type)

HB High Performance High Speed Type Digital Servo

Hot Bodies digital servos combine speed, reliability and toughness
in one highly efficient unit! We offer two dialled-in types of
digital servos to make your choices easy. Both are very strong yet
fast, but the #67991 DSJ-1SS is
fastest with an amazing transit time of 0.06 seconds per centimeter
of movement with a strength of 13kg per cm! The #67992 DSJ-2ST is nearly as fast at 0.09
seconds per centimeter, but has a whopping 16kg per cm of holding
power!